Title: Comprehensive dynamic compensating device for distribution network
Application Number: 200610150057 Application Date: 2006.10.25
Publication Number: 1937349 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02J3/18;H02J3/16;H02J3/01;H02J3/26
Applicant(s) Name: Sifang-Qingneng Electric Address:
Inventor(s) Name:
Attorney & Agent: wuhong wei
Abstract:
    Based on change of load, and dynamic output idle work in large range, the disclosed compensating device filters off harmonic in order to reach purposes: raising power factor, compensating asymmetric three phases, lowering flicker, and harmonic distortion rate so as to reduce loss of distribution network, and improve quality of power supply. The compensating device includes inversion bridge, and control unit. Through connection transformer being connected to distribution network, and connected to capacitor bank directly, the inversion bridge is in bridge structure of three levels and three single phases. Using direct current control algorithm based on phase-shifting carrier wave, the control unit collects bus voltages and currents from PT and CT on bus, as well as output current of device from CT of device, and DC voltage from capacitor bank to generate wave form in pulse-width modulation in order to control on/off of each power electronic device in the inversion bridge.
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